Hello Sandra, please order it on the Products page: https://www.uradmonitor.com/products/ . To get it before Christmas you should also add the “Express shipping” option to your chart.

Hello Maarten,

Thanks for these observations. I added ppm for co2 and ch2o, this refers to the concentration of these gases in air. Please check the various thresholds and their effects on human health.

For VOC we have no standard unit, it is more of a score computed out of REDOX chemical reactions on the sensor’s crystal. This will get improved by adding a new adaptive algorithm that analyses few minutes of previous data. Bosch already has this, and we might use their solution directly.

Thank you,
Radu